A Numerical Method for Determining Supercritical CO2 Breakthrough Pressure in Saturated Low-permeability Sandstone core

被引：0

作者：

Zhao S. ^{[1
]}

Li Y. ^{[2
]}

Suo R. ^{[1
]}

Yu Q. ^{[3
]}

机构：

[1] School of Ecology and Environment, Inner Mongolia University, Hohhot

[2] School of Civil Engineering, Tianjin University, Jinnan District, Tianjin

[3] School of Water Resources and Environment, China University of Geosciences (Beijing), Haidian District, Beijing

来源：

Zhongguo Dianji Gongcheng Xuebao/Proceedings of the Chinese Society of Electrical Engineering | 2021年 / 41卷 / 04期

基金：

中国国家自然科学基金;

关键词：

CO[!sub]2[!/sub] breakthrough pressure; CO[!sub]2[!/sub] geological storage; Numerical simulation; Sensitive study; Step-by-step method;

D O I：

10.13334/j.0258-8013.pcsee.200943

中图分类号：

学科分类号：

摘要：

CO2 breakthrough pressure plays an important role in CO2 geological storage capacity, selecting target storage sites and assessing the safety of caprock. In order to explore the numerical simulation method that can be used to predict the CO2 breakthrough pressure, a numerical method based on step-by-step method was proposed by using the numerical software of COMSOL Multiphysics, and the numerical simulation of CO2 breakthrough pressure in a saturated low-permeability rock core were carried out. The results show that when the rock core is completely saturated with water, the breakthrough pressure and breakthrough time of CO2 were 5.4 MPa and 70 h, respectively. Compared with the experimental results, it is proved that the numerical simulation is reasonable. Meanwhile, sensitivity studies on the interfacial tension in CO2-H2O systems and the key parameters of m/l values in van Genuchten (VG) model are carried out. The results show that, under the same interfacial tension, the greater the m/l parameters, the greater the CO2 breakthrough pressure and time. In addition, with the increase of interfacial tension in CO2-H2O systems, the breakthrough pressure and time both tend to decrease. This study provides numerical information for further studies on CO2 breakthrough in rock core and the evaluation of caprock. © 2021 Chin. Soc. for Elec. Eng.

引用

页码：1250 / 1257

页数：7

共 32 条

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